. Introduction to botany. Botany. THE STEM AND THE LEAF 57 all the year round, and in these photosynthesis is carried on by the green lajer of the cortex beneath the epidermis of the stem. In many dry countries there are switch plants, which either bear a few little leaves during a small part of the year or are entirely leafless, as is shown in figure 37. Like the cacti, such plants, and others with flat- tened stems and little leaf sur- face (fig. 38), do the greater part or all of their photosynthetic food-making in the green cells of the cortex of the stem. Man}' of our common forest trees
. Introduction to botany. Botany. THE STEM AND THE LEAF 57 all the year round, and in these photosynthesis is carried on by the green lajer of the cortex beneath the epidermis of the stem. In many dry countries there are switch plants, which either bear a few little leaves during a small part of the year or are entirely leafless, as is shown in figure 37. Like the cacti, such plants, and others with flat- tened stems and little leaf sur- face (fig. 38), do the greater part or all of their photosynthetic food-making in the green cells of the cortex of the stem. Man}' of our common forest trees and shrubs do food-making in the green layer of the bark of the young twigs, until tliis is shut away from the light by layers. Fig. 38. Branches of ihiehlenbeckia, a plant with scanty leaf surface and flattened stems which do most of the photosynthetic work of the plant /, flowers; I, leaves; s, stems. One hall natural size. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York, [etc. ] Ginn and company
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